<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>天气案例</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
    <div id="root">
        <h2>今天天气很{{info}}</h2>
        <button @click="changeWeather">切换天气</button>
    </div>
</body>
<script type="text/javascript">
    new Vue({
        el: '#root',
        data: {
            isHot: true
        },
        computed: {
          info() {
              return this.isHot ? '炎热' : '凉爽'
          }
        },
        methods: {
            changeWeather() {
                this.isHot = !this.isHot
            }
        }
    })
</script>
</html>